[Bug driver/40960] POSIX requires that option -D have a lower precedence than -U

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40960

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=80535

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #5)
> 
> Confirmed, I think a configure option would be a good way to go about it.

Other options as mentioned in bug 80535 comment 1 include respecting the
POSIXLY_CORRECT environment variable, and/or adding a -posix-std= flag to
mirror the existing -std= flag for the language standard